Paper-bag machine



(No Model.) i

W. B. PURVIS.

- PAPER BAG MAGHINB. i No. 434,461. Patented Aug. 19, 1890.`

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VILLIAM B. PURVIS, OF PHILADELPHIA, PENNSYLVANIA.

PAPER-BAG MACHINE.

SPECIFICATION forming part of Letters Patent No. 434,461, dated August 19, 1890. A` Application filed February 4, 1890. Serial No. 339,159. v(No model.) t

To all whom it may concern,.-

Beit known that I, WILLIAM B. PURvis, of the city and county of Philadelphia, and State of Pennsylvania, have invented an lmprovement in Paper-Bag Machines, of which the following is a specification.

My invention has reference to paper-bag machines; and it consists of certain improvements, which are fully set forth in the following specification, and shown in the accompanying drawings, which form a part hereof.

More particularly my invention relates to machines for forming a satchel square bottom upon. a bellows sidefold tube, and is an improvement upon the apparatus disclosed in my application, Serial No. 295,971, filed .I anuary 10,1889, in which are shown suction-formers provided with longitudinal depressions or grooves for drawing out the paper fed between the suction-formers and forming it into a square-box shape and then drawing it out and folding it into the satchel square bottom.

My invention relates more specifically to certain improvements Vinthe ,construction of the formers and in the devices for controlling and guiding the air-currents to the formers.

In this improvement, in addition to the suction for forming the ends of the tube, I eln- 'ploy air-blasts guided by means of certainl hoods and air-guides, so as to assist the action accomplish the breaking down of the tube into the box shape.

My invention also relates to improvementsV Vin construction of the formers whereby they may be adj usted vto suit dierent sizes of bags, so that upon thesame machine there may be made a variety of sizes of bags.

In the drawings, Figure l is a plan 'View of my improved apparatus. Fig'. 2 is a side elevation of the same. Fig. 3 is a cross-sectional view, upon an enlarged scale, on line o: a; of Fig. 2. the detached formers; and Fig.`5 is a perspective View of a detached portion of the former.

A A are endless carriers or aprons for conducting the papertubes between the formers B.

C C are suitable guiding and feeding roll- Fig. 4 isa perspective view of oneofl ers for guiding and feeding the aprons A A with their adjacent faces in contact between the formers B B. These guiding and feeding rollers are mounted in any convenient manner upon the main frame of the machine D.

The formers B are constructed of a hollow box shape having a fiat vertical perforated face b and a laterally-projecting perforated portion, forming with the flat perforated surface b a longitudinal groove or depression F. One end of this laterally-projecting portion is curved or tapering to the fiat surface b. This laterally-projecting portion is preferably madein sections E E', the upper section E having its horizontal perforated surface arranged near the upper edge of the fiat surface b and slightly curved. It is preferably made integral withthefiat surface b'or fixedly secured to it. The second section E, the upper surface of which is in a lower horizontal plane than the perforated surface of the portion E', so as to form therewith a break or step e, is secured to the bo'X portion B by means of bolts R through slots r, so that this section lmay be raised or lowered so as to expose a greater or less amount of the fiat surface b and to increase or diminish the distance of the transverse groove F from the upper edge or top of the box-shapedl former B to suit different sizes of bags. The upper end of the surface of this adjustable section is provided with a small inclined perforated piece G, which is arranged immediately adjacent to the section E', inclining to the horil tachable from the adjustable section E, as

illustrated'in Fig. 5. The two formers are arranged ,opposite to each othcr and separated a slight distance, as illustrated in Figs. 2 and 3, with the endless bands or carriers@ running between their fiat unperforated faces.

II are suction tubes or pipes connecting with the interiors of the box-shaped formers IOO lll

B B and connecting with suitable snctioncreating devices.

I is a small hood or covering arranged over the space between the upper portions of the formers or sections E.

J J are two air-guides, forming an air-funnel, arranged across the faces of the formers B B a short distance from the end of the hood or coverin g I and having projecting portions l7', extending inward between the adjacent horizontal portions of the formers and slightly curved inward,so as to guidethe air-currents in opposite directions, or away from each other, as indicated by the arrows.

K is an air-blast pipe opening into the `funnel formed by the air-guides J J.

L is an enveloping hood extendingl upward lfrom the cds of the forme-rs and curvingoutwardly.

M is a second hood or guide arranged adjacent to and behind the hood L, leaving a passage between it and the hood L.

K is a blast pipe or tube opening between the hood or guides M and L for introducing a blast of air between them toward the ends of the suction-formels. These hoods L and M may be supported in suit-able frames N N upon the formers B or the main frame ofthe machine.

O is a folder, and I) the flattening-roller for flattening down the folded bags. The ends of the bags may be pasted before they are flattened and folded in the usual manner.

The guides J J, forming the air-funnel, are preferably secured to the horizontal portions of the formers by means of slotted ears, so as to admit of the adjustment of these horizontal portions, as heretofore described.

I find it expedient to make an opening or slot Q in the groove F between the horizontal and vertical portions of the formers to increase the suction at these points and more perfectly to break down the end of the tube into the square-box shape. A similar slot Q may also be formed in the groove or depression F between the inclined piece Gr and the adjacent flat horizontal surface of the piece E.

The various steps in the formation of the bag are similar to those set out in my application heretofore referred to, the improved construction of the present application being intended to more perfectly perform these steps. The bellows side-fold tube is conducted between the adjacent surface of the carriers A A with its end projecting between the perforated faces of the formers B B. As this end passes between the horizontal perforated face of the portion E', the two sides of the paper are drawn apart by the suction against the inclined perforated surfaces, and as the bag is conducted onward the ends are drawn down upon the triangular pieces G, thc grooves F between these triangular pieces and the horizontal surface of the portion E forming a crease, the formation of which assisted by the greater suction of air through the slot or opening Q. bag passes onward from the triangular pieces G, it is drawn into the box shape between the vertical and horizontal faces l) and E, and as it continues to traverse through the formers the endsare drawn out against the taperin g ends of the formers, and thence pass to the pasting and folding devices.

of the sections E to the inclined piece G and again to the fiat horizontal surface of the section E down the steps g and c, respectively, assists in more perfectly breaking the tube into the box shape, and the openings or slots Q and Q in the grooves or depressions F and F more perfectly form the crease of the box shape.

The hood I over the upper part of the opening between the formers prevents the air entering at that point and causes the air-cur rents to rush in, as indicated by the arrows. The air-currents striking against the inside of the bag assist in opening it The air-blast, entering through the `funnel or airguides J J and being guided in opposite directions, enters into the box-shape opening in the end of the bag and tends more perfectly to force the paper against the perforated surface and into the grooves or depressions lf and F. Theairblast from the pipe K', entering between the hoods or guides M and L, (which also constitute an air-funnel,) acts upon the sides of the bag and assists the formers in drawing them into diamond shape, which is the final step of the formers to the bottom of the bag before pasting and folding.

As the The dropping or springing of the paper from the faces IOO If desired, the pipes K K may be eonnected with the pressure side of the suction-creating devices by which a suction is created through the pipes H I-I.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In apaper-bag machine, the combination of two suction-'formels having perforated surfaces, between which the ends of the paper' tube are fed, and provided with two independent grooves arranged at different portions of the length of the forlners and out of line with each other.

2. In a paper-bag machine, the combination of two suctionforrners, each having a perforforated surface over which the paper is passed, formed with two or more steps, in moving over which the paper is caused to abrubtly open.

3. Ina paper-bag machine, the combination of two suction-formels, each having a vertical perforated face and a horizontal perforated section vertically adjustable with referu ence to said vertical perforated face.

4. In apaper-bag machine, the combination of two suction-formers, each consisting of a vert-ical perforated portion and a horizontal perforated portion madelin sections, one of said sections being vertically adjustable rrclatively to the vertical portion.

IIO

ISO

5. In a paper-bag machine, the combination of two suction-formers, each having vertical and laterally-projecting perforated surfaces, said laterally-projecting perforated surface being made in sections arranged in different planes relatively to one another and forming steps in said laterally-projecting perforated surface.

6. In a paper-bag machine, the combination of two suction-formels, each having a vertical perforated portion, a laterally-project-ing perforated portion at the forward end of said vertical portion, and a second laterally-projecting perforated portion arranged adjacent thereto and in a lower plane and having a portion of its surface immediately adjacent to the higher lateral portion inclining upwardly.

7. In a paper-bag machine, the combination of two suction-forniers having perforated surfaces, between which the ends of the paper tube are fed, and provided with two independent slotted grooves arranged at different portions of the length of the formers and out of line with each other.

S. In a paper-bag machine, the combina tion, with two suction-formers having` perforated lsurfaces, between 'which the ends of the paper tube are fed, of an air-funnel located near the ends of said forlners, and anl airblast for blowing air through said funnel.

9. In a paper-bag machine, the combination, with two suction-formels having perfo rated surfaces, between which the ends of the paper tube are fed, of an air-funnel located near the center of said formers, and an airblast for blowing air through said funnel.

10. In a paper-bag machine, the combination, with two suction-formers having perforated surfaces, between which the ends of the paper tube are fed, of a hood or covering over the upper part of said formers, an'air-funnel at or about the center thereof, an air-blast pipe opening to said funnel, a hood or cover extending upwardly from the rear ends of said formers, a guide located behind and adjacent to said rear hood, leaving a space between it and said rear hood, and an air-blast pipe openingv between said rear hood and adjacent air-guide for introducing an air-blast near the rear ends of said formers to assist the action of the suction thereof.

ll. In a paper-bag machine, the combination,with two suction-formers having perforated surfaces, between which the ends of the paper tube are fed, of air-blast pipes for introducing a blast of air to said suction-formers at or about their middle, and also near the ends thereof to assist the suction of the formers in forming bottoms of the tube.

In testimony of which invention I have hereunto set my hand.

WILLIAM B. PURVIS. v

Witnesses:

ERNEST HOWARD HUNTER, A. J. DUNN. 

